Simulation studies on image reconstruction algorithm for portable electrical capacitance tomography

Abstract

Electrical capacitance tomography (ECT) is a non-invasive and non-intrusive internal visualization tomographic modality which promises a better quantification by providing cross-sectional distribution information of any kind of multiphase flow. The studies discussed in this paper aim to investigate the non-iterative and iterative image reconstruction for 16 channels of portable electrical capacitance tomography (ECT) through simulation work. Linear Back Projection (LBP) as a non-iterative algorithm was compared with the Landweber and generalized vector sampled pattern matching (GVSPM) iterative algorithm for four cases which are core flow, annular flow, stratified flow and two circles by evaluation of percentage error and image correlation. The results show that Landweber algorithm produces lowest percentage error, higher correlation coefficient and acceptable elapsed time for all cases studied. Iterative image reconstruction will produce accurate results by eliminating the artifacts near actual object and enhance the capability of segmented ECT in multiphase flow identification.